"For evening, the First Lady changed into city-perfect cocktail attire - a stunning floor-length navy blue gown from high-end French designer Azzedine Alaia, layered with a corset from her Chicago favorite, Peter Soronen - to deliver a keynote address at the Time 100 Most Influential People Awards at Time Warner Center.

"At the podium, Obama's voice quivered with emotion as she told the crowd she never imagined she'd be a role model for girls around the globe."